Dear all i have this idea of rendering a river network so that each river starts as a very thin blue line, and the line width increases little by little as the river goes. i wouldn't like to modify the original file (eg cutting rivers in pieces and give a different width to each piece) but all rivers are digitized with the right direction so i was wondering if there is an expression to teach qgis what is the start end of a river, and assign a wider line for any given distance, for example: from start to 200m - line width 0.1 from 200m to 400m - line width 0.2 from 400m and over - line width 0.3 i think this is an interesting problem because i cannot find a "from - to" command in qgis expression language, neither i know how to properly exploit the line direction with code, which would come useful in many other ways... any python expert out there can help?
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